It's a little more complicated than that because new sell orders will come to the market if the price rapidly rises but for a thin order book, this is approximately how it will be. What they are saying is, based on the current order book on the exchanges, if you buy 200 BTC worth of ICN, the price will move up to around $9 because that 200 BTC will eat up all the sell orders (again, currently on the books) for ICN.